Sounds like you want savapage https://www.savapage.org/
It by default runs on its own port but that is easy fixable with a reverse proxy.
this post was submitted on 06 Sep 2024
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Gotta say, this question and the process explained threw me for a loop.
You have a network print server where it's advertising an available printer, but instead of the native printer system on a client device, you want to NOT use the CUPS server to print? That's what it's there for. I'm confused on why you have it then.
If your goal is just to have clients print as directly as possible to a printer...you already have that with CUPS running. I guess I'm not getting why submitting via web form is useful in this case.
I want to print from a web page: upload the file, hit print button.
In this way I can print from whatever device I want even without any driver installed or configuration.
CUPS already does this though, and that's where I'm getting confused. This is the entire point of CUPS. If your issue is with drivers, then you need to configure it to just print from its own driver via a spooled queue like PostScript, or maybe IPP.
I known cups can share printers and queues.
What is unclear?
I don't want to pull drivers or install cups on devices. I want to print from anywhere just uploading a file to a web page.
If I have lots of devices or just want to let somebody print from his phone/tablet without installing or configuring anything...
With cups I still need to touch the system or the device somehow to let it print.
You don't have to install drivers or CUPS on client devices. Linux and Android support IPP out of the box. Just make sure your CUPS on the server is multicasting to the LAN.
You may need to install Avahi on the server if it's not already (that's what does the actual multicasting). The printer(s) should then auto magically appear in the print dialogs on apps on Linux clients and in the printer service on Android.
On Linux it may take a few seconds to appear after you turn it on and may not appear when it's off. On Android it shows up anyways as long as the CUPS server is on.
I am saying that CUPS requires zero drivers or anything else from clients. It advertises the printer on the network, a device sees it, and submits a job. That's it. Exactly what you are describing doing with a web form, except CUPS already does all of this.
Sounds like you're not sure how it works.
It still requires the device to be capable to print...
And the user to find the printer select it and so on. And must expose more ports on the network beside 443...
So, indeed cups is a great solution, but not to the problem I want to solve.
I do use cups in fact for the trusted part of the network, driverless printing for windows and Linux. Android doesn't even need cups since it picks up the printer directly from the printer itself (AirPrint or whatevee that's called).
Just going to say it again: IPP (Internet Printing Protocol) via CUPS solves for all of this, but you seem destined for a specific thing you want to do and don't actually need help with your current issues, so not sure why you posted here.
Ok, I have a web browser on a locked down device and nothing else: how do I print a pdf or a photo using IPP?
I have: a camera, a browser, a file manager (kind of, think of an iPhone or some stock android business device) and I need to print a photo taken with the camera or a pdf file sent to me via email or WhatsApp?
The device is connected to the WiFi guest network with limited internet access (if any) and as only available service a server with port 443 open (a reverse proxy on that, captive portal and such).
In my experience, there is no way to print via cups in this configuration. Maybe I am wrong?
Well if you're talking about isolated networks, that's a different story, and not in your post. That's a completely different scenario than what you posted about.
In that case, you could also use port forwarding and IPP via CUPS to achieve the same result without needing to build a web form. If you're unfamiliar with CUPS, try enabling the WebUI and setting it up from there, but there is an option to allow printing from the internet, meaning it's enabling IPP and accepting requests from outside the source network it's hosted on (not the global internet, because surely you have a firewall on the edge router of your home network), effectively creating a bridge between your two networks for this specific purpose and only using that one port for printing.
I made something crude with python and flask, but it's only to print address labels, always the same settings (paper size and so on)
So i just put a textbox, press the button and it prints there.
When printing generic stuff, you would need to set paper type, paper size, color or BW, if have both sides printed, if printing from a specific tray, then some kind of user authentication (i am lazy and i didn't care about privacy so i used cloudflare access), so the complexity becomes much bigger.
Before making my crude script I searched long time for a free or cheap solution, but I didn't find. If you find, let me know
Yes, this is what I am afraid of... There is nothing out there for this task.
Hope to find something or maybe try to create something using lpr on the background... But this is the las hope as I have little time.
Just have a web form post a printable file and have the back end use lpr? Are you able to write code for PHP or nodejs?
Yes, sure I am... Would probably prefer a bash CGI because I like challenges :)
(Author and such would be managed by my reverse proxy)
But I would prefer something already baked if it exist